EP0572398A4 - Arc suppressing cluster assembly - Google Patents

Arc suppressing cluster assembly

Info

Publication number
EP0572398A4
EP0572398A4 EP91910800A EP91910800A EP0572398A4 EP 0572398 A4 EP0572398 A4 EP 0572398A4 EP 91910800 A EP91910800 A EP 91910800A EP 91910800 A EP91910800 A EP 91910800A EP 0572398 A4 EP0572398 A4 EP 0572398A4
Authority
EP
European Patent Office
Prior art keywords
block
pin
skirt
collar
header
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91910800A
Other versions
EP0572398A1 (en
Inventor
Henry H Heimbrock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Standex International Corp
Original Assignee
Standex International Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standex International Corp filed Critical Standex International Corp
Publication of EP0572398A1 publication Critical patent/EP0572398A1/en
Publication of EP0572398A4 publication Critical patent/EP0572398A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/803—Electric connectors or cables; Fittings therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5219—Sealing means between coupling parts, e.g. interfacial seal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/56—Means for preventing chafing or fracture of flexible leads at outlet from coupling part
    • H01R13/567—Traverse cable outlet or wire connection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/66—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with pins, blades or analogous contacts and secured to apparatus or structure, e.g. to a wall

Definitions

  • This invention relates to a cluster assembly connection to a three pin header inside a hermetically-sealed compressor.
  • the invention is particularly useful in applying power to a scroll
  • a hermetically-sealed compressor usually for air conditioning or refrigeration applications, has a sealed metal housing.
  • a motor and compressor 10 are mounted within the housing.
  • the electrical power to the motor is connected through a known header sometimes referred to as a glass-to-metal seal.
  • the header is in the form of a cup-shaped metal support having three holes.
  • a pin is mounted in
  • the three clips are mounted in a cluster block having three parallel passageways through which the connector clips and leads pass.
  • the clips are equiangularly arrayed in a position to be pushed upon the three pins of the header, thereby forming the electrical con ⁇ nection between the motor and the header pins.
  • a problem of arcing between pins has been observed. That arcing can be of such magnitude as to destroy the header, thus rendering the whole compressor useless. This has been observed particularly in connection with the scroll compressor and is believed to arise out of the drawing of a vacuum within the compressor at startup, the vacuum tending to promote arcing between pins.
  • the objective of the present invention has been to eliminate arcing at startup in a hermetically- sealed compressor.
  • the objective of the invention is attained by modifying the cluster block and the manner in which it cooperates with the header so as to more than double the path through the air between adjacent header pins that the arc must travel if there is to be any arcing at all.
  • the cluster block has been modified to provide a projecting cylindrical insulative skirt surrounding each of the holes through which the header pins pass to make connection to the clips within the cluster block.
  • Each pin on the header has an insulative collar completely surrounding the pin.
  • Each skirt projecting from the cluster block ' is of a large enough diameter to completely surround the collar on the pin.
  • FIG. 1 is a diagrammatic, elevational view, partly in section, of the interior of a hermetically- sealed compressor
  • Fig. 2 is a disassembled perspective view of the header and cluster assembly
  • Fig. 3 is a cross-sectional view taken through two adjacent pins of the cluster assembly with the invention applied.
  • a hermetically-sealed compressor 10 has a housing 11 within which is con ⁇ tained a motor 12 connected to drive a compressor 13.
  • the power to the motor as, for example, a 220 volt, single phase three wire system, is applied to three pins 15 of a header 16.
  • the header 16 best shown in Figs. 2 and 3, has a cup-shaped metal element 17 which is welded to the housing 11 of the compressor 10.
  • the cup-shaped element carries three pins 15 by means of glass beads 18.
  • the beads 18 are sealed around the pins 15 and are sealed to the metal cup-shaped element 17.
  • Each pin is necked down as shown at 20 in Fig. 2 and is surrounded by a ceramic cylindrical collar 21.
  • the reduction in diameter of each pin causes it to function as a fuse and the collar con ⁇ fines the flow of molten metal from a fused pin.
  • the motor has leads 25 which terminate in clips 26 (Fig. 3) .
  • cluster block 28 An example of a cluster block is shown in Patent No. 3,566,341 which is fully incorporated herein by reference.
  • the cluster assem ⁇ bly has two opposed surfaces 29 and 30. The surface 29 is completely closed, as contrasted to what is shown in Patent No. 3,566,341. Furthermore, the end
  • the surface 30 has three key-shaped holes 35 that are equiangularly spaced and aligned with the pins 15.
  • the clips 26 attached to the leads 25 are 10 aligned with those holes so that when the cluster block or cluster assembly is pushed upon the pins 15 of the header 16, the pins will enter the clips 26 and make electrical connection therewith thereby connect ⁇ ing the motor 12 to the power supply connected to the 15 outside of the header 16.
  • each hole 35 of the block 28 is surrounded by a dielectric or insulative skirt 40.
  • Each skirt 40 is cylindrical and has an inside diameter.that is larger 20 than the outside diameter of the collars 21 on the header 16.
  • the skirts 40 surround the collars 21 as shown in Fig. 3. This creates a long pathway through the air for an arc to travel between adjacent 25 pins. More particularly, absent the skirts 40, the arc between adjacent pins had to travel a distance D directly from one pin to the other as shown in Fig. 3. In a typical header, that distance would be approxi ⁇ mately ll/32nds of an inch.
  • the arc must travel through a tortuous path consisting of two segments of length X, two segments of length Y between the skirt 40 and collar 21, and one segment of length Z across the two collars 40.
  • the sum of those distances is about 24/32nds of an inch, or more than twice the distance of the previous arc path.
  • the tortuous character of the path further reduces the likelihood that an arc will jump from one pin to another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Description

\
-1- Arc Suppressing Cluster Assembly
This invention relates to a cluster assembly connection to a three pin header inside a hermetically-sealed compressor. The invention is particularly useful in applying power to a scroll
5 compressor.
BACKGROUND OF THE INVENTION
A hermetically-sealed compressor, usually for air conditioning or refrigeration applications, has a sealed metal housing. A motor and compressor 10 are mounted within the housing. The electrical power to the motor is connected through a known header sometimes referred to as a glass-to-metal seal.
The header is in the form of a cup-shaped metal support having three holes. A pin is mounted in
15 each of the three holes and is mechanically supported in the cup-shaped element by glass which is bonded to both the pin and the metallic element.
Within the compressor, the three leads to the motor are terminated in connector clips each
20 having a receptacle that slides down upon the pin.
The three clips are mounted in a cluster block having three parallel passageways through which the connector clips and leads pass. The clips are equiangularly arrayed in a position to be pushed upon the three pins of the header, thereby forming the electrical con¬ nection between the motor and the header pins. In the operation of the compressor, a problem of arcing between pins has been observed. That arcing can be of such magnitude as to destroy the header, thus rendering the whole compressor useless. This has been observed particularly in connection with the scroll compressor and is believed to arise out of the drawing of a vacuum within the compressor at startup, the vacuum tending to promote arcing between pins.
BRIEF SUMMARY OF THE INVENTION The objective of the present invention has been to eliminate arcing at startup in a hermetically- sealed compressor.
The objective of the invention is attained by modifying the cluster block and the manner in which it cooperates with the header so as to more than double the path through the air between adjacent header pins that the arc must travel if there is to be any arcing at all.
More specifically, the cluster block has been modified to provide a projecting cylindrical insulative skirt surrounding each of the holes through which the header pins pass to make connection to the clips within the cluster block. Each pin on the header has an insulative collar completely surrounding the pin. Each skirt projecting from the cluster block ' is of a large enough diameter to completely surround the collar on the pin. When the cluster assembly is 5 applied to the header with each pin making a con¬ nection to its respective clip, the insulative skirts of the cluster assembly slide down around the collars. With the cluster assembly applied in this manner, the air path from pin to pin includes the distance that 10 the skirt extends from the cluster block at two adjacent pins. Thus, where the distance between pins, prior to the invention, is approximately ll/32nds of an inch, with the invention applied, the distance, through air, from pin to pin has been increased to 15 approximately 24/32nds.
It has been found that the application of the invention to compressors with scroll motors has significantly reduced or eliminated the arcing prob¬ lem. 20 BRIEF DESCRIPTION OF THE DRAWINGS
The several features and objectives of the invention will become more readily apparent from the following detailed description taken in conjunction ' with the accompanying drawings in which:
25 Fig. 1 is a diagrammatic, elevational view, partly in section, of the interior of a hermetically- sealed compressor; Fig. 2 is a disassembled perspective view of the header and cluster assembly; and
Fig. 3 is a cross-sectional view taken through two adjacent pins of the cluster assembly with the invention applied.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Fig. 1, a hermetically-sealed compressor 10 has a housing 11 within which is con¬ tained a motor 12 connected to drive a compressor 13. The power to the motor, as, for example, a 220 volt, single phase three wire system, is applied to three pins 15 of a header 16. The header 16, best shown in Figs. 2 and 3, has a cup-shaped metal element 17 which is welded to the housing 11 of the compressor 10. The cup-shaped element carries three pins 15 by means of glass beads 18. The beads 18 are sealed around the pins 15 and are sealed to the metal cup-shaped element 17.
Each pin is necked down as shown at 20 in Fig. 2 and is surrounded by a ceramic cylindrical collar 21. The reduction in diameter of each pin causes it to function as a fuse and the collar con¬ fines the flow of molten metal from a fused pin.
The motor has leads 25 which terminate in clips 26 (Fig. 3) . The leads and the terminal clips
26 are disposed in longitudinal passageways 27 formed in a cluster block 28. An example of a cluster block is shown in Patent No. 3,566,341 which is fully incorporated herein by reference. The cluster assem¬ bly has two opposed surfaces 29 and 30. The surface 29 is completely closed, as contrasted to what is shown in Patent No. 3,566,341. Furthermore, the end
5 31 of the cluster block is closed as contrasted to the cluster block of 3,566,341.
The surface 30 has three key-shaped holes 35 that are equiangularly spaced and aligned with the pins 15. The clips 26 attached to the leads 25 are 10 aligned with those holes so that when the cluster block or cluster assembly is pushed upon the pins 15 of the header 16, the pins will enter the clips 26 and make electrical connection therewith thereby connect¬ ing the motor 12 to the power supply connected to the 15 outside of the header 16.
In accordance with the present invention, each hole 35 of the block 28 is surrounded by a dielectric or insulative skirt 40. Each skirt 40 is cylindrical and has an inside diameter.that is larger 20 than the outside diameter of the collars 21 on the header 16. When the cluster assembly 28 is applied to the header 16, the skirts 40 surround the collars 21 as shown in Fig. 3. This creates a long pathway through the air for an arc to travel between adjacent 25 pins. More particularly, absent the skirts 40, the arc between adjacent pins had to travel a distance D directly from one pin to the other as shown in Fig. 3. In a typical header, that distance would be approxi¬ mately ll/32nds of an inch.
With the application of the skirt 40, the arc must travel through a tortuous path consisting of two segments of length X, two segments of length Y between the skirt 40 and collar 21, and one segment of length Z across the two collars 40. The sum of those distances is about 24/32nds of an inch, or more than twice the distance of the previous arc path. Further- more, the tortuous character of the path further reduces the likelihood that an arc will jump from one pin to another.
From the above disclosure of the general principles of the present invention and the preceding detailed description of a preferred embodiment, those skilled in the art will readily comprehend the various modifications to which the present invention is susceptible. Therefore, I desire to be limited only by the scope of the following claims and equivalents thereof:
What is claimed is:

Claims

1. A cluster block for application to a three pin header having cylindrical collars surrounding each pin comprising: a block of insulative material, said block having three parallel passage¬ ways, open at one end of said block, each passageway for the receipt of a clip and attached lead, said block being closed at the opposite end of each passageway, said block having two parallel surfaces, one of said surfaces having three equiangu¬ lar holes aligned with said clips, three elongated skirts, each said skirt depending from said one surface and encircling a hole, each skirt being of a diameter to surround a collar, whereby when a cluster block is applied to a header, said skirt surrounds a collar and approximate¬ ly doubles the distance an arc must travel from pin to pin.
2. A cluster block as in claim 1 in which said skirt has a diameter of approximately one-half inch and a length of approximately one-fourth inch. 3. A cluster block as in claim 1 in which all exterior surfaces of said block are closed except said pin-receiving holes and three entrances for lead wires.
4. A cluster block for application to a three pin header having cylindrical collars surrounding each pin comprising: a block of insulative material, said block having three parallel passage¬ ways, open at one end of said block, each passageway for the receipt of a clip and attached lead, said block having two parallel surfaces, one of said surfaces having three equiangu- lar holes aligned with said clips, three elongated skirts depending from said one surface, each said skirt encircling one of said holes, each skirt being of a diameter to surround a said collar, whereby when a cluster block is applied to a header, said skirt surrounds a collar and approximate¬ ly doubles the distance an arc must travel from pin to pin. 5. The combination comprising: a header having three equiangularly spaced pins passing therethrough, on one side of said header each pin is surrounded by a dielectric collar having a first outside diameter, a dielectric cluster block containing three connector clips slidably mounted on said three pins, said cluster block having a skirt surround- ing each clip and depending from said block to sur¬ round said collar, whereby any pin-to-pin arc must travel from a pin, down a skirt, across an air gap, and up a skirt to an adjoining pin.
AMENDED CLAIMS
[received by the International Bureau on 26 November 1991 (26.11.91); original claims 1-5 replaced by amended claims 1-4 (2 pages)]
(1) A cluster block for application to a three pin header on the inside of a hermetically-sealed compressor, said header having a cylindrical collar surrounding each pin comprising: a block of insulative material, said block having three parallel passageways, open at one end of said block, each passageway for the receipt of a clip and attached lead, said block being closed at the opposite end of each passageway, said block having two surfaces parallel to said passageways, one of said surfaces having three equiangularly- spaced holes aligned with said clips, three elongated skirts, each said skirt being integral with the block and depending from said one surface and encircling a hole, each skirt being of an inside diameter larger than the outside diameter of said collar to create an airspace between skirt and collar when said skirt surrounds said collar, whereby when a cluster block is applied to a header, each said skirt surrounds a collar and approxi¬ mately doubles the distance an arc must travel from pin to pin.
(2) A cluster block as in claim 1 in which said skirt has a diameter of approximately one-half inch and a (3) A cluster block as in claim 1 in which all exterior surfaces of said block are closed except said pin-receiving holes and three entrances for lead wires.
(4) A cluster block for application to a three pin header on the inside of a hermetically-sealed compressor, said header having a cylindrical collar surrounding each pin comprising: a block of insulative material, said block having three parallel passageways, open at one end of said block, each passageway for the receipt of a clip and attached lead, said block having two surfaces parallel to said passageways, one of said surfaces having three eguiangularly- spaced holes aligned with said clips, three elongated skirts depending from said one surface, each said skirt being integral with said block and encircling one of said holes, each skirt being of an inside diameter larger than the outside diameter of said collar to create an airspace between skirt and collar when said skirt surrounds said collar, whereby when a cluster block is applied to a header, each said skirt surrounds a collar and approxi¬ mately doubles the distance an arc must travel from pin to pin.
EP91910800A 1991-02-20 1991-06-05 Arc suppressing cluster assembly Withdrawn EP0572398A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US658007 1991-02-20
US07/658,007 US5131858A (en) 1991-02-20 1991-02-20 Arc suppressing cluster assembly

Publications (2)

Publication Number Publication Date
EP0572398A1 EP0572398A1 (en) 1993-12-08
EP0572398A4 true EP0572398A4 (en) 1996-03-13

Family

ID=24639527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91910800A Withdrawn EP0572398A4 (en) 1991-02-20 1991-06-05 Arc suppressing cluster assembly

Country Status (4)

Country Link
US (1) US5131858A (en)
EP (1) EP0572398A4 (en)
JP (1) JPH06505114A (en)
WO (1) WO1992015134A1 (en)

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Also Published As

Publication number Publication date
US5131858A (en) 1992-07-21
WO1992015134A1 (en) 1992-09-03
EP0572398A1 (en) 1993-12-08
JPH06505114A (en) 1994-06-09

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